Improved UI organization by moving the language selector into the same fieldset
as the tenant email input, since both are related to email notifications. The
language selector now only appears when email notifications are enabled.
Changes:
- Move language selector inside tenant email fieldset (no separate fieldset)
- Add label for tenant email input field
- Simplify notification language label text
- Remove unused notification-language-legend translation key
- Language selector shares visibility condition with email field
This provides a more logical grouping of related settings and reduces visual
clutter when email notifications are disabled.
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Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>